利用地震资料预测准噶尔盆地南缘山前构造地层压力  

Using Seismic Data to Predict Formation Pressure in Piedmont Structures at the Southern Margin of Junggar Basin

作　　者：杨虎 周鹏高[2] 孙维国 石建刚 陈伟峰 YANG Hu;ZHOU Penggao;SUN Weiguo;SHI Jiangang;CHEN Weifeng(Research Institute of Engineering Technology, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China;Karamay Vocational & Technical College, Karamay, Xinjiang 834000, China)

机构地区：[1]中国石油新疆油田分公司工程技术研究院,新疆克拉玛依834000 [2]克拉玛依职业技术学院,新疆克拉玛依834000

出　　处：《新疆石油地质》2017年第3期347-351,共5页Xinjiang Petroleum Geology

基　　金：基金项目:新疆油田;吐哈油田勘探开发增产关键技术(2012E-31)

摘　　要：准噶尔盆地南缘山前构造钻探程度低,利用测井资料计算地层压力的准确性不理想,尤其是山前构造深部未钻探地层的压力预测。为此,以四棵树凹陷的西湖背斜—独山子背斜为例,在二维地震资料测井约束反演的基础上获得二维层速度,有效提取了2口超深井(独山1井和西湖1井)处的地震层速度。采用空间插值算法,利用单井的地层压力构建二维地层压力模型,并依据二维层速度计算出区域空间地层压力。通过可视化描述与分析,获得地层压力的空间分布规律。模型预测结果与实测地层压力对比,预测精度大于85%.地震与测井相结合预测深部复杂地层压力的方法为准噶尔盆地南缘山前构造深井井身结构设计、钻井液安全密度窗口确定、减少钻井复杂情况提供了科学依据。The exploration degree at the southern margin of Junggar basin is very low and the calculation accuracy of formation pressure with logging data is not satisfying,especially for pressure prediction of undrilled formations in deep piedmont structures.Therefore,takingXihu anticline?Dushanzi anticline in Sikeshu sag as an example,2D interval velocity is obtained on the basis of logging constraint inversion of the2D seismic data and the seismic interval velocities are effectively extracted in the2ultra?deep wells such as Dushan1and Xihu1.A2D formation pressure model is established by using spatial interpolation algorithm and formation pressures in individual wells,then formation pressures in regional spaces can be calculated based on the2D interval velocity.The spatial distribution of formation pressure is obtained through visualized description and analysis.The comparison of the results predicted by the model with the field testing pressures shows that the prediction accuracy is higher than85%.The seismic?logging combination method to forecast pressures in deep and complex formations could provide scientific basis for well bore structure design,safe drilling fluid density window determination and efficient drilling operation.

关 键 词：准噶尔盆地 南缘山前构造 地震资料 地震层速度 地层压力 

分 类 号：P631.445[天文地球—地质矿产勘探]